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| <title>clGetHostTimer</title> |
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| <body> |
| <div class="refentry"> |
| <a id="id-1"></a> |
| <div class="titlepage"></div> |
| <div xmlns="" class="refnamediv"> |
| <a xmlns="http://www.w3.org/1999/xhtml" id="clGetHostTimer"></a> |
| <h1>clGetHostTimer</h1> |
| <p>Return the current value of the host clock as seen by device.</p> |
| </div> |
| <div class="refsynopsisdiv"> |
| <h2></h2> |
| <div class="funcsynopsis"> |
| <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"> |
| <tr valign="bottom"> |
| <td> |
| <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"> |
| <a class="link" href="scalarDataTypes.html" target="pagedisplay">cl_int</a> |
| <strong class="fsfunc">clGetHostTimer</strong> |
| (</code> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_device_id</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">device</var> |
| , </td> |
| </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">cl_ulong *</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">host_timestamp</var> |
| <code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="parameters"></a> |
| <h2>Parameters</h2> |
| <div class="variablelist"> |
| <dl class="variablelist"> |
| <dt> |
| <span class="term"> |
| <code class="varname">device</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| A device returned by |
| <a class="citerefentry" href="clGetDeviceIDs.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceIDs</span></span></a>. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">host_timestamp</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| Will be updated with the value of the current timer in nanoseconds. The |
| resolution of the timer may be queried via |
| <a class="citerefentry" href="clGetPlatformInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetPlatformInfo</span></span></a> |
| and the flag |
| <code class="constant">CL_PLATFORM_HOST_TIMER_RESOLUTION</code>. |
| </p> |
| </dd> |
| </dl> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="notes"></a> |
| <h2>Notes</h2> |
| <p> |
| Return the current value of the host clock as seen by |
| <code class="varname">device</code>. This value is in the same timebase |
| as the host_timestamp returned from |
| <a class="citerefentry" href="clGetDeviceAndHostTimer.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceAndHostTimer</span></span></a>. |
| The implementation will |
| return with as low a latency as possible to |
| allow a correlation with a subsequent application |
| sampled time. The host timestamp and device |
| timestamp returned by this function and |
| <a class="citerefentry" href="clGetDeviceAndHostTimer.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceAndHostTimer</span></span></a> |
| each have an implementation defined timebase. The timestamps |
| will always be in their respective timebases |
| regardless of which query function is used. The |
| timestamp returned from |
| <a class="citerefentry" href="clGetEventProfilingInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetEventProfilingInfo</span></span></a> |
| for an event on a device and a device |
| timestamp queried from the same device will |
| always be in the same timebase. |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="errors"></a> |
| <h2>Errors</h2> |
| <p> |
| <code class="function">clGetHostTimer</code> will return <span class="errorname">CL_SUCCESS</span> |
| with a time value in <code class="varname">host_timestamp</code> if provided. |
| Otherwise, it returns one of the following errors: |
| </p> |
| <div class="itemizedlist"> |
| <ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_DEVICE</span> if <code class="varname">device</code> is not |
| a valid OpenCL device. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">host_timestamp</code> is NULL. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_RESOURCES</span> if there is a failure to allocate resources |
| required by the OpenCL implementation on the device. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_HOST_MEMORY</span> if there is a failure to allocate |
| resources required by the OpenCL implementation on the host. |
| </li> |
| </ul> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="specification"></a> |
| <h2>Specification</h2> |
| <p><img src="pdficon_small1.gif" /> |
| <a href="https://www.khronos.org/registry/cl/specs/opencl-2.1.pdf#page=83" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="clGetDeviceAndHostTimer.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceAndHostTimer</span></span></a>, |
| <a class="citerefentry" href="clGetPlatformInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetPlatformInfo</span></span></a> |
| </p> |
| </div> |
| <div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2015 The Khronos Group Inc. |
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| distribute, sublicense, and/or sell copies of the Materials, and to |
| permit persons to whom the Materials are furnished to do so, subject to |
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| in all copies or substantial portions of the Materials. |
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